KR20130069315A - Circuit breaker - Google Patents

Abstract

PURPOSE: A circuit breaker is provided to hold a thermal magnetic excess current tripping device on an insulating member and a cover, thereby improving the breaking capacity of the device suitable for automatic assembly. CONSTITUTION: A circuit breaker includes a switching mechanism(51), an excess current tripping device(52), a middle base(2), a movable contactor, a breaking part, a base(3), and a cover(1). The switching mechanism is placed at mutually facing frame plates with a manipulating handle. The excess current tripping device rotates the switching mechanism with detecting an excess current. The switching mechanism and the excess current tripping device on which the switching mechanism is placed are mounted on the middle base. The movable contactor at a cross bar rotates with being linked with the switching mechanism. The breaking part includes an arc extinguishing device(53) cuts an arc between the movable contactor and a fixed contactor(9) being repetitively connected to and separated from the movable contactor. The cover covers the base housing the breaking part, the middle base, and components housed in the middle base. The middle base has a first hole. The first hole is placed at a surface perpendicular to a direction in which the middle base is inserted into the base, and faces the breaking part. A member for forming the excess current tripping device adheres to the first hole. The excess current tripping device at an electrode in which the switching mechanism is not placed is held by the cover, and an insulating member is placed between the switching mechanism and the excess current tripping device.

Description

Circuit breaker {CIRCUIT BREAKER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to circuit breakers such as circuit breakers and earth leakage breakers, and more particularly, to a configuration in which an overcurrent tripping device or the like is disposed so as to be suitable for automatic assembly.

The circuit breaker has the function of opening and closing the electric circuit by operating the operation handle of the circuit breaker, that is, not only the switch function, but also the electric circuit breaker to prevent the loss of the wires or the load equipment due to the overcurrent flow. It plays a big role. In the detection of this overcurrent, it is well known that the electric current is classified into thermal, electronic, and electronic methods. Although automatic assembly can be obtained relatively easily, there is a disadvantage that the product cost is high. Thus, there is a circuit breaker of the thermal electromagnetic type, which is suitable for automatic assembly and prevents the attachment of the molten metal to the opening / closing mechanism portion and the overcurrent tripping device caused by the short circuit interruption.

In this circuit breaker, an opening / closing mechanism portion disposed on a frame plate facing each other with an operation handle and an overcurrent tripping device for detecting an overcurrent and rotating the opening / closing mechanism portion are housed in a middle base and provided in a crossbar rotating in conjunction with the opening / closing mechanism portion. The interruption | block part containing the arc-extinguishing apparatus which cuts out the arc which arises between a contactor and this movable contactor and the fixed contactor which repeats folding is accommodated in a base. A middle base is placed on top of this base, and a circuit breaker is comprised by covering a base and each component accommodated in the middle base with a cover. Moreover, the middle base is provided with the 1st hole in the bottom face, and this 1st hole is adhere | attached by the yoke which comprises the overcurrent tripping apparatus. The overcurrent tripping device is firmly fixed to the middle base by press fitting into the middle base and fitting the bent portion provided in the yoke to the second hole provided in the middle base. Then, as described above, assembly is possible in order from the upward direction, and the configuration is suitable for automatic assembly (see, for example, Japanese Patent Laid-Open No. 2011-134570).

[Patent Document 1] Japanese Patent Application Laid-Open No. 2011-134570

In the conventional circuit breaker, the breaker and the switch mechanism including the extinguishing device are divided by the middle base. However, the middle base is provided with a first hole in the bottom thereof so that the yoke of the overcurrent tripping device is viewed by the breaker. Thus, at the time of breaking, the pressure rise of the breaking portion due to arc generation is received by the yoke through the first hole, and the overcurrent tripping device needs to be firmly fixed to the middle base.

On the other hand, in order to further improve the breaking performance, it is necessary to further increase the pressure of the breaking portion due to arc generation. For this purpose, the overcurrent tripping device needs to be firmly fixed to the middle base. However, in order to cope with automatic assembly, there is a problem in that the overcurrent tripping device cannot be relyed on the attachment or the like.

Moreover, since the overcurrent tripping device which is an energization part and the opening / closing mechanism part which are not an energization part are provided in regular intervals so that it may not contact, when the overcurrent tripping device is press-fitted into the middle base, for example, the bending part of a yoke may be a 2nd hole of a middle base. Even if the overcurrent tripping device is excited in the cover direction without being fitted into the cover, there is a problem that it may be assembled without any problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is to obtain a circuit breaker having a high breaking capacity suitable for automatic assembly while being a thermoelectric overcurrent tripping device.

The circuit breaker according to the present invention includes an opening / closing mechanism portion disposed on a frame plate facing each other with an operation handle, an overcurrent tripping device for detecting an overcurrent to rotate the switching mechanism portion, and an opening / closing mechanism portion and an overcurrent tripping device having the switching mechanism portion. A blocking part including a middle base to be fixed, a movable contact provided on a crossbar pivoting in conjunction with the opening / closing mechanism part, and an arc extinguishing device for cutting an arc generated between the movable contactor and a fixed contact that repeats folding; And a cover for covering the middle base, the base, and each component housed in the middle base. The middle base includes a base for facing the blocking portion at a plane perpendicular to the direction in which the middle base is inserted into the base. 1 hole is provided, and this 1st hole is provided in the member which comprises the overcurrent tripping apparatus. It is in the circuit breaker with the adhesive, the over-current tripping device of the pole part opening and closing mechanism is not placed is a slipping by the cover, between the actuator and bent over-current tripping device, the insulating member is disposed.

According to the present invention, a circuit breaker having a high breaking capacity suitable for automatic assembly can be provided by catching the overcurrent tripping device by the insulating member and the cover.

1 is an external perspective view showing a circuit breaker in Embodiment 1 of the present invention.
FIG. 2 is a view showing the housing of the member in the middle base in FIG. 1. FIG.
3 is a diagram illustrating an overcurrent tripping device of FIG. 1.
4 is a perspective view illustrating the back surface of the cover of FIG. 1.
FIG. 5 is an enlarged perspective view illustrating a state in which an insulating member is attached to the overcurrent tripping device of the central electrode in FIG. 1.
6 is a plan view and a sectional view of the middle base in FIG.
7 is a plan view and a sectional view of the base in FIG.
8 is a cross-sectional view when the middle base is fitted to the base in FIG. 1.
FIG. 9 is a view illustrating a blocking unit in FIG. 1.

Embodiment 1

1 is a perspective view of a circuit breaker in a tripped state in Embodiment 1 of the present invention, in which FIG. 1 (a) shows an appearance, and FIG. 1 (b) shows a cover, a middle base, The figure exploded into the base is shown. 2 is a view showing the housing of the member to the middle base in FIG. 1 (b), FIG. 3 is a view showing the overcurrent tripping device and the yoke for one pole in FIG. 2, and FIG. 4 is a perspective view showing the back surface of the cover. 5 is an enlarged perspective view showing a state in which the insulating member 54 is attached to the overcurrent tripping device 52 of the central electrode. 6 and 7 show a middle base and a base, respectively, and FIGS. 6A and 7A are views seen from X in FIG. 1B (FIG. 1B). 6B and 7B are cross-sectional views, and FIG. 8 is a cross-sectional view when the middle base is fitted to the base (FIGS. 6 and 7B). )to be. FIG. 9 is a view showing the housing of the member to the base in FIG.

In Fig. 1, the insulating case of the circuit breaker 101 for three poles is composed of a cover 1, a middle base 2 and a base 3. Among these, the middle base 2 has an opening / closing mechanism part 51 provided with an operation handle 4, an overcurrent tripping device 52 with a number of poles (in this case, three), and an overcurrent tripping device 52 with a central pole. ) And an insulating member 54 sandwiched between the opening and closing mechanism part 51 are accommodated, and the base unit 3 is also provided with a number of pole extinguishing devices 53. Moreover, about the middle base 2, the side plate of the middle base 2 is formed in the recessed part 3a * 3a of the base 3, in order to prevent the damage by the internal pressure rise by the arc which generate | occur | produces at the time of interruption | blocking. 2a and 2a) are fitted together. Accordingly, the side plates 2a and 2a form part of the insulating case. In addition, the operation handle 4 protrudes from the handle window hole 1a of the cover 1, and is turned in the ON direction (on the ground in FIG. 1, clockwise) or in the OFF direction (on the ground in FIG. 1, counterclockwise). From the point of operation and the positional relationship of the arc-extinguishing apparatus 53, it is as well known that 5 is a power supply side terminal, and 6 is a load side terminal.

As shown in FIG. 2, the overcurrent tripping device 52, the opening-closing mechanism part 51, and the arc extinguishing device 53 (refer FIG. 1 (b)) are also known. That is, it is connected to the power supply side terminal 5 via the fixed contact 9 which is fixed to the yoke 7 with the fixed contact 8 at one end, and the flexible copper wire 10, and once The folding is repeated between the movable contact 13 having the movable contact 11 and held by the crossbar 12 which rotates in association with the opening / closing mechanism part 51, and is fixed by the folding, particularly by the opening. An arc generated between the contact 8 and the movable contact 11 is cut by the arc extinguishing device 53.

The opening / closing mechanism part 51 is a handle arm 15 which is freely axially supported by a frame 14 formed by a pair of frame plates 14A and 14B facing each other, and an operation handle which is fixed to the handle arm 15. (4) By the rotation of the trip bar 16, the latch 17, and the latch 17 which are also rotatably supported by the frame 14 and rotated by the operation of the overcurrent tripping device 52 which will be described later. The so-called unit is formed by a crossbar 12 which interlocks with an operating toggle link mechanism (not indicated) and is axially supported by the frame 14 and rotates. The frame plate 14A (14B) is provided with foot portions 14A1 and 14A2 before and after the power supply and load direction, and the insertion holes provided in the middle base 2 by these foot portions 14A1 and 14A2. By inserting and inserting in (2b) (refer FIG. 6 (a)), the opening-closing mechanism part 51 is fixed to the predetermined position in an insulation case. Here, the detailed description of the toggle link mechanism, that is, the manual operation (on-off, off-on) of the circuit breaker 101, the tripping operation or the reset operation after the trip is not an essential part of the present invention. The description is omitted (refer to Japanese Patent Application Laid-Open No. 2008-317552 for the explanation of each operation).

As shown in Fig. 3, the overcurrent tripping device 52 is electrically connected to the fixed contactor 9, which has a fixed contact 8 at one end thereof when viewed from the current path (hereinafter, simply ' Connection 18), the relay terminal 19 connected to this coil 18, the bimetal 20 connected to this relay terminal 19, and the desired by the heat generation of this bimetal 20 It is comprised by the flexible copper wire 21 (refer also FIG. 2) connected to arbitrary places for obtaining the curvature amount, and the load side terminal 6 connected to this flexible copper wire 21, and a coil In order to activate the electromagnetic force at (18), the fixed iron core 22 fixed together with the yoke 7 to the fixed contactor 9, which covers the fixed iron core 22 and is located at the inner diameter of the coil 18 Insulated pipe 23 and movable core 24 located in the inner diameter of the insulated pipe 23 and moving against a pressure spring not shown in the figure. There is sex. That is, the overcurrent tripping device 52 is a thermoelectric type, and the thermodynamic part is formed by the relay terminal 19, the bimetal 20, and the flexible copper wire 21, the yoke 7, the coil 18, and the fixed iron core. The electronic part is formed by the insulating pipe 23, the pressure spring, and the movable iron core 24, respectively.

As shown in FIG. 4, the back surface of the cover 1 is provided with the accommodating space 1a which accommodates the coil 18 of the overcurrent tripping apparatus 52, and the cover 1 is provided in the edge part of this accommodating space 1a. Is attached to the base, and the protrusion part 1b which hangs the yoke end 7b of the yoke 7 is provided.

In addition, as shown in FIG. 5, the insulating member 54 is formed in substantially "co" shape, and the yoke end 7b of the overcurrent tripping apparatus 52 of the center pole is attached to the groove | channel provided in the recessed part. . After the overcurrent tripping device 52 is press-fitted into the middle base 2, the convex portion 54a of the insulating member 54 is fitted with a play in the pair of frames 14 of the overcurrent tripping device 52, The opening and closing mechanism 51 is placed on the insulating member 54. Since this insulating member 54 is provided in the vicinity of the fixed contact 8, when it is formed from the material which discharge | releases extinguishing gas at the time of short circuit interruption, it contributes to the increase of the gas pressure by arc generation at the time of interruption. In this material, when nylon-based resin is used as a matrix and ceramic fibers and metal hydroxide are added as fillers, insulation recovery immediately after a short circuit can be promoted.

The operation of the overcurrent tripping device 52 is well known as described above, i.e., as shown in Figs. 2 and 3, when the overload current flows for a predetermined time or more, the bimetal 20 is moved to the right side on the ground. By bending, the adjustment screw part 20a rotates the trip bar 16, and by this rotation, the latch 17 which abuts on the trip bar 16 rotates, and the opening / closing mechanism part 51 trips and a movable contactor 13 opens from the fixed contact 9. On the other hand, when a short circuit current flows, a large magnetic force is generated in the coil 18, and the movable iron core 24 moves to the right direction against the spring force of the pressure spring, thereby directly rotating the latch 17, Similarly, the opening and closing mechanism 51 is tripped. In addition, the storing of the overcurrent tripping device 52 in the insulating case is performed by inserting the load-side terminal 6 into the base 3 and the yoke 7 and the relay terminal 19 into the middle base 2. This is described below.

As shown in Figs. 6 and 7, the above-described load side terminal 6 and the power supply side terminal 5 are each inserted grooves 3b (load side terminals 6) from the meaning of the relay point of the current path. ), It is not necessary to fix it very firmly only by inserting and inserting it into the insertion groove 3c (power supply side terminal 5).

On the other hand, the relay terminal 19 is fitted by press fitting into the insertion hole 2c provided in the middle base 2. As described above, the yoke end 7b to which the fixed contactor 9 is fixed in the overcurrent tripping device 52 is respectively connected to the insulating member 54 at the pole where the opening and closing mechanism 51 is placed. Since the other pole is caught by the protrusion 1b of the cover 1, the yoke end 7b is used as a point when a force in the direction in which the relay terminal 19 is pulled out is applied. Although the 7 is about to rotate, since the relay terminal 19 is fitted into the insertion hole 2c, it cannot rotate, and it does not come out of the insertion hole 2c.

In addition, about the yoke 7, the bimetal 20 which is mechanically connected (through the fixed contact 9, the coil 18, and the relay terminal 19) which has a movable part called the movable iron core 24 is present. In view of this, since the movement (curvature) of these movable iron cores 24 and the bimetallic 20 influences the current characteristics of the circuit breaker 101, fixing by the insertion should be firm.

Therefore, in the present embodiment, the yoke 7 is provided with two bent portions 7a, and the middle base 2 is provided with a second hole 2e to which the bent portions 7a are fitted. When the dimensional relationship between these curved parts 7a and the 2nd hole 2e is demonstrated in detail, with respect to the both ends dimension A containing the curved part 7a, between the partitions of the middle base 2 of the site | part in which this yoke 7 is inserted, Let N be a little narrower (A> B). On the other hand, internal dimension C between the partitions of the site | part of the 2nd hole 2e is made to be equal to A (A = C), and the area | region of internal dimension C is matched with the surface area D of the curved part 7a. In this way, when the yoke 7 is inserted, the partition formed by the thermoplastic resin slightly spreads outward, and when the bent portion 7a reaches the internal size C, the partition that has been opened outwards returns to its original position, and the curved portion ( The flow of 7a) is prevented. That is, once the overcurrent tripping device 52 is inserted, the overcurrent tripping device 52 is fixed even with at least one pole, and it is difficult to extract it, which means that it is firmly fixed to a predetermined position. It also contributes to the stabilization of current characteristics.

In this way, it is not necessary to fix the overcurrent tripping device 52 to the insulating case by, for example, screwing or the like, and as shown in FIGS. 1A and 2, each member is removed from the upward direction on the page. Since it is formed as a circuit breaker 101 by what is called lamination | stacking, automatic assembly becomes possible and it is possible to hold down the manufacturing cost. In addition, although the 2nd hole 2e penetrates literally as a "hole" in the metal mold | die manufacture of the middle base 2, if it is not necessarily limited to this form, if the yoke 7 can be prevented from flowing, The "hole" may be blocked.

However, when manufacturing cost of a metal mold | die is considered, it is preferable to make it penetrate as a "hole." By the way, as shown also in FIG.1 (b), the extinguishing apparatus 53 is located in the lower part of the middle base 2 of the site | part to which this overcurrent tripping apparatus 52 was fixed. On the other hand, although the 2nd hole 2e is occluded to the bending part 7a to some extent, it is not perfect. Therefore, the arc gas generated in the arc extinguishing device 53 at the time of short circuit interruption is expected to reach the opening / closing mechanism part 51 through the second hole 2e, which is not preferable. Therefore, in this Embodiment 1, the projection part 3e was provided in the power supply-loading direction of the base 3 also including the position of the 2nd hole 2e (refer FIG.7 (b)). As a result, as is apparent from FIG. 8, when the middle base 2 is fitted to the base 3, the second hole 2e is completely occluded by the protrusion 3e, and therefore, particularly the blocking performance. Can be improved. In addition, the protrusions 3e are provided in advance in order to secure the insulation between the poles, in particular, the creepage distance. In other words, it does not involve cost increase called parts addition.

By the way, regarding the improvement of the breaking performance, in this embodiment (described in the page of the background art), the arc traveling blocking method is adopted. The arc traveling blocking method induces an arc generated at the time of short circuit interruption while using an electromagnetic repulsive force to the arc extinguishing device 53, and finally secures an arc path in the arc extinguishing device 53 while securing a current path by the arc. To cut. Specifically, the arc generated between the two contacts 9 and 13 is fixed to the yoke 7 on the fixed contact 9 side and the arc runner 25 on the movable contact 13 side (see FIG. 9). Each transition. By this transition, the current paths are supplied from the grid 53a to the yoke 7 to the coil 18 to the power supply terminal 5 to the arc runner 25 to the arc extinguishing device 53. Although the load side terminal 6 is used, at this time, the direction of the current (arrow E) of the arc runner 25 and the direction of the current from the lower side to the top of the grid 53a (arrow) shown in FIG. 9 (arrow) The repulsive force of the magnetic field caused by F) in the other direction and the direction of the current (arrow G, see FIG. 3) toward the fixation point between the arrow F and the fixed contact 9 at the yoke 7 are also different directions. By the repulsive force of the magnetic field generated by the arc, the arc is led to the arc extinguishing device 53. The induced arc is cut, and as a result, the large current accompanying this short circuit is quickly interrupted.

As is clear from the description so far, the yoke 7 needs to be exposed to the stationary contact 9 and the grid 53a, but this is achieved by the following measures. In other words, a first hole 2d is provided in the bottom surface on which the overcurrent tripping device 52 of the middle base 2 is fixed, and by fixing the overcurrent tripping device 52, the first hole 2d is yoked ( Occluded by 7). In other words, the grid 53a and the yoke 7 at the top of the arc extinguishing device 53 face each other without any inclusion therebetween. Moreover, although the width narrow part extends and is provided in the 1st hole 2d on the right side (on the lower surface of FIG. 6 (a)), both contactors 9 and 13 are inserted in this width narrow part, and a movable contactor ( It is secured as a rotation track of 13). In addition, 26 is an arc gas expansion pressure, the reflecting plate as a pressure receiving part which promotes the opening operation of the movable contact 13, 27 is a core which promotes an electromagnetic repulsive force, and the "blocking part" mentioned in the claim is an example. For example, in addition to these reflecting plates 26 and the core 27, the area | region comprised by the arc extinguishing apparatus 53 and the arc runner 25 is shown.

Other measures related to the above-mentioned "enhancement of the opening operation" will be described here. In FIG. 3, if the hollow part 22a is provided in the fixed iron core 22, and the rod part 28 which abuts or approaches the movable core 24 is provided in this hollow part 22a, the page of a background art As described above, since the rod 28 collides with the movable contactor 13 by the movement of the movable iron core 24, the contact 28 and 13 are quickly opened without waiting for the operation of the opening and closing mechanism 51. You can. In addition, in the arc traveling interruption system of the first embodiment, as described above, since the coil 18 is included in the current path by the arc, the movable iron core 24 is still caused by the magnetic force of the coil 18. In addition, since the rod 28 remains moving in the direction of opening the movable contactor 13, it is possible to prevent rotation (so-called return) in the contact direction of the movable contactor 13, thereby maintaining a high arc voltage. That is, the transition of an accelerated arc can be aimed at. Reference numeral 29 denotes a barrier provided between the yoke 7 and the coil 18. The barrier 29 allows the coil 18 to conduct current (arc) during current detection as well as arc holding. The current) does not bypass and generates an appropriate magnetic force.

In the case where the circuit breaker 101 has a short circuit, high pressure gas is generated between the fixed contact 8 and the movable contact 11, that is, the arc generated at the interruption part. A force for raising the yoke 7 exposed from the first hole of the base 2 to the blocking portion in the direction of the cover 1 is generated.

According to this embodiment, since the insulating member 54 and the protrusion 1b of the cover 1 hold the yoke end 7b, there is no fear that the yoke 7 will flow in the direction of the cover 1. It is possible to raise the pressure at the time of breaking further, and the circuit breaker of the high breaking capacity suitable for automatic assembly can be obtained.

In the overcurrent tripping device 52, since the relay terminal 19 is press-fitted into the insertion hole 2c provided in the middle base 2, the parts are assembled from one direction and the yoke 7 is covered with a cover ( Since there is no fear of flow in the direction of 1), automatic assembly can be realized simultaneously while satisfying basic performance essential for circuit breakers such as stabilization of characteristics and improvement of breaking performance. This can contribute to a significant profit improvement, especially for small circuit breakers that are cost competitive.

In addition, the yoke 7 is pushed into the middle base 2 and the overcurrent tripping device 52 is caused to flow in the opposite direction to the pressing direction in order to fix the overcurrent tripping device 52 to the middle base 2. Since the 2nd hole 2e for not providing is provided, fixing to the middle base 2 of the yoke 7 becomes more firm, and stabilization of a characteristic and improvement of the breaking performance can be aimed at.

Moreover, this insulating member 54 is formed in substantially "co" shape, the groove | channel is provided in the recessed part for attaching to the yoke end 7b, and the convex part 54a is a part of the opening / closing mechanism part 51. Moreover, as shown in FIG. Since the overcurrent tripping device 52, the insulating member 54, and the opening / closing mechanism part 51 can be assembled with each other even when the assembly is carried out with a clearance in the pair of frames 14, the positional relationship between each other is assured and automatically The structure is suitable for assembly.

In addition, since the insulating member 54 is formed of a material that emits an arc extinguishing gas at the time of short circuit interruption, arc extinguishing occurs between the fixed contact 8 and the movable contact 11 at the time of short circuit interruption. There is also an effect to encourage.

Moreover, since this insulating member is formed from the material which mix | blended ceramic fiber and a metal hydroxide as a filler based on nylon resin as a base material, it also has the effect of promoting the insulation recovery immediately after a short circuit interruption.

In addition, in this embodiment, although the insulating member 54 was demonstrated to the example attached only to the pole overcurrent tripping apparatus in which the switching mechanism part 51 was provided, the protrusion 1b of the cover 1 is removed, or the protrusion ( By adjusting the height of 1b), the locking member may be disposed between the cover 1 and the overcurrent tripping device of the pole where the opening / closing mechanism part 51 is not placed. At this time, similarly to the insulating member 54, if the locking member is formed of a material that emits an arc extinguishing gas at the time of short circuit interruption, it is generated between the fixed contact 8 and the movable contact 11 at the time of short circuit interruption. Promote arc arcing. In addition, when the locking member is formed of a nylon resin-based matrix and composed of a ceramic fiber or metal hydroxide as a filler, the recovery of insulation immediately after a short circuit can be promoted.

1 cover, 1b tongue,
2 middle base, 2d first hole,
2e 2nd hole, 3 base,
3e protrusion, 4 handle,
7 yokes, 7a bends,
7b yoke end, 9 fixed contacts,
12 crossbars, 13 movable contactors,
14 frames, 51 opening and closing mechanism,
52 overcurrent tripping device, 53 extinguishing device,
54 insulation, 101 circuit breaker.

Claims (6)

A switchgear mechanism disposed on a frame plate facing each other with an operation handle, an overcurrent tripping device for detecting an overcurrent to rotate the switchgear portion, and the switchgear portion and the overcurrent tripping device on which the switchgear portion are placed are fixed. An arc extinguishing device for cutting an arc generated between a middle base, a movable contactor provided in a crossbar pivoting with the opening / closing mechanism part, and a fixed contactor repeating the folding contactor; And a cover for covering the cover, a base for receiving the block, and a cover covering each of the parts accommodated in the middle base, the base, and the middle base.
The middle base is provided with a first hole on the surface orthogonal to the direction perpendicular to the direction in which the middle base is inserted into the base, and the first hole is formed by a member constituting the overcurrent tripping device. In the circuit breaker to be bonded,
The overcurrent tripping device of the pole where the switch mechanism part is not placed is caught by the cover, and an insulation member is disposed between the switch mechanism part and the overcurrent tripping device. The method according to claim 1,
And a relay terminal on the side of the overcurrent tripping device, in which the fixed contactor is not provided, is press-fitted into an insertion hole provided in the middle base. The method according to claim 1,
A second hole for not causing the overcurrent tripping device to flow in a direction opposite to the pressing direction in order to fix the overcurrent tripping device to the middle base while the member of the overcurrent tripping device is pressed into the middle base; The circuit breaker characterized by the above-mentioned. 4. The method according to any one of claims 1 to 3,
And the overcurrent tripping device of the pole in which the opening / closing mechanism is not placed is caught by the cover through a locking member. The method of claim 4,
And the insulating member and the catching member are formed of a material that generates an arc extinguishing gas when it comes into contact with an arc generated when the circuit breaker is blocked. The method according to claim 5,
The said insulating member and the said latching member are circuit breakers characterized by the material which mix | blended ceramic fiber or a metal hydroxide as a filler with a nylon resin as a base material.

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